Well, I don't know how to do it via sessions, but I could show you another way I do it. It may not be the best way of doing it, but it gets the job done.
First, I added a column to my "database", or whatever it's called to users called last_active. Every time a user is logged in, it gives them a time stamp and adds it to last_active (every page they load while logged in it updates the time stamp).
//last active
if($logged) {
$time = date("omdHis");
$updatetime = mysql_query("UPDATE users SET `last_active` = '$time' WHERE `username` = '$logged[username]'");
}else{
}Then I use the time stamp with a simple function that I created.
function whosonline() {
//current time
$timestamp = date("omdHis");
//subtracts 15 minutes of the current time
$subtract = (date('omdHis', strtotime('- 15 minutes')));
$result = mysql_query("SELECT * FROM users WHERE `last_active` > '$subtract' ORDER BY username DESC");
if(1 > mysql_num_rows($result)) {
echo "There's currently no user online.";
}else{
//loops until everyone has been added
while($online = mysql_fetch_array($result)) {
//the users information
$onlineuser = $online['username'];
echo '<a href="profile/'.$onlineuser.'">'.$onlineuser.'</a> ';
}
}
}As I said above, it may not be the best, but it gives a rough idea of how you could do it.